考虑水文变异的河道生态径流研究

Study on Ecological Flow with the Considerations of Hydrological Mutations

采用Mann-kendall等多种突变检验方法对广西澄碧河流域坝首和平塘两水文站径流序列进行突变综合检测,并用逐月最小生态径流计算法和逐月频率计算法分别研究变异前和变异后的河道内最小生态径流和适宜生态径流情况。结果表明,变异后最小生态径流总体小于变异前,丰水期时段变异前适宜生态流量普遍小于变异后,平水期变化不明显,枯水期时段变异前适宜生态流量普遍大于变异后;坝首及平塘适宜生态径流满足率枯水期平均下降分别为10.8%和7.5%,丰水期则平均上升分别为3.7%和5.8%,平水期无明显变化。

Various methods such as Mann-kendall arc applied to test the mutation of runoff series in Bashou Hydrological Station and Pingtung Hydrological Station of Chenghi River Basin respectively. The minimum ecological flows and optimal ecological flows before and after mutation are analyzed by using monthly minimum ecological flow computation method and monthly frequency computation method respectively. The results show that： （a） the minimum ecological flow after mutation is less than the one before mutation; （b） the optimal ecological flow before mutation is generally less than the one after mutation in wet season, while the result is the opposite in dry season, and no significant change in average water season; and （c） the satisfactory rates of optimal ecological flow in Bashou Station and Pingtang Station are decreased by 10. 8% and 7.5% respectively in dry season, while in wet season the satisfactory rate are increased by 3.7% and 5.8% respectively, and no significant change in average water season.